This set of FACTS Multiple Choice Questions & Answers (MCQs) focuses on “Shunt Compensation – SVC”.
1. SVC is an acronym for ________
a) Static Voltage Compensator
b) Shunt VAR Compensator
c) Series VAR Compensator
d) Static VAR Compensator
View Answer
Explanation: SVC is an acronym for static VAR compensator. Here VAR denotes volt-ampere reactive, i.e. the reactive power. SVC relates to the voltage regulation of the associated power system.
2. SVC is constructed based on gate turnoff (GTO) thyristors.
a) True
b) False
View Answer
Explanation: SVC stands for Static VAR Compensator. Basically SVC is constructed based on conventional thyristors. On the other hand, Static Compensator (STATCOM) is constructed based on gate turnoff (GTO) thyristors.
3. SVC is an example of VSC FACTS controller.
a) True
b) False
View Answer
Explanation: Static VAR compensator is an example of variable impedance type FACTS controller. It is not a voltage source FACTS controller. SVC is basically a shunt connected controller.
4. What does SVC employ to achieve compensation in a power transmission system?
a) 3∅ capacitor banks and inductor banks
b) 3∅ capacitor banks
c) 3∅ inductor banks
d) 3∅ resistor banks
View Answer
Explanation: SVC employs 3∅ capacitor banks and 3∅ inductor banks to achieve compensation in a power transmission system. Depending on the system voltage value with respect to its specified rating, either 3∅ capacitor banks or 3∅ inductor banks are switched on or off. Thus reactive power compensation is achieved by a SVC.
5. SVC employs ________ to absorb reactive power for compensating in a transmission system.
a) TSC
b) TCR
c) TSR
d) TCR or TSR
View Answer
Explanation: SVC employs TCR or TSR to absorb reactive power for compensating in a transmission system. Basically TSR is 3∅ reactor banks which is switched on or off by three thyristor switches as per the required controllability. Again TCR is 3∅ reactor banks which is phase controlled by three thyristor switches as per the required controllability.
6. SVC employs ________ to generate reactive power for compensating in a transmission system.
a) TSC
b) TCR
c) TSR
d) TCR or TSR
View Answer
Explanation: SVC employs TSC to generate reactive power for compensating in a transmission system. Basically TSC is 3∅ capacitor banks which is switched on or off by three thyristor switches as per the required controllability. These 3∅ capacitor banks are connected on the secondary side of the coupling transformer.
7. The circuit configuration of SVC is similar to that of breaker-switched capacitors, reactors and mechanical tap-changing transformers.
a) True
b) False
View Answer
Explanation: The circuit configuration of SVC is similar to that of breaker-switched capacitors, reactors and mechanical tap-changing transformers. It appears so because the SVC employs reactive impedances and conventional thyristor valves (switches) as controlled elements. However, the SVC exhibits much faster response and sophisticated operation controls than the later.
8. SVC can provide reactive compensation.
a) True
b) False
View Answer
Explanation: SVC can provide reactive compensation. This is because it is able to generate reactive power. However, SVC cannot exchange real power (other than its own losses) when connected with the ac power system.
9. SVC regulates the voltage at its terminals by controlling the amount of reactive power ________ the associated power system.
a) either being injected into or absorbed from
b) only being injected into
c) only being absorbed from
d) neither being injected into nor being absorbed from
View Answer
Explanation: SVC regulates the voltage at its terminals by controlling the amount of reactive power either being injected into or absorbed from the associated power system. SVC depends on TCR or TSR for absorbing reactive power. SVC depends on TSC for generation of reactive power.
10. Prior to invention of SVCs, there were no devices for limiting overvoltage.
a) True
b) False
View Answer
Explanation: Prior to invention of SVCs, there were no devices for limiting overvoltage. Preceding invention of SVCs, static saturable reactors were present for limiting overvoltage. Also powerful gapless metal oxide arresters existed before SVCs for limiting dynamic over voltages.
11. Technically SVC can be seen as ________
a) static VAR absorber
b) static VAR generator
c) neither static VAR generator nor absorber
d) static VAR generator or absorber
View Answer
Explanation: A shunt-connected static VAR generator or absorber. This is because output of SVC is adjusted to exchange capacitive or inductive current with the electrical power system. Accordingly SVC acts as static VAR generator or absorber to sustain or manage bus voltage of the electrical power system.
12. SVC is NOT based on thyristors.
a) True
b) False
View Answer
Explanation: SVC is DEFINITELY based on thyristors. SVCs do employ reactor which is a thyristor-controlled or thyristor-switched. SVCs also use thyristor-switched capacitor. It may even exhibit a combination of both.
13. Thyristors employed in SVC are with the gate turn-off capability.
a) True
b) False
View Answer
Explanation: Thyristors employed in SVC are without the gate turn-off capability. SVC incorporates separate equipment (capacitors or reactors) for leading and lagging VARS. Reactors employed in SVC are thyristor-controlled or thyristor-switched and capacitors are thyristor-switched only. They donot have gate turn-off capability.
14. Each of TCR and TSR is the superset of SVC.
a) True
b) False
View Answer
Explanation: Each of TCR and TSR is the superset of SVC. In TCR a thyristor-based ac switch controls the current through the reactor. In TSR the stepwise control of effective reactance is achieved by the thyristor associated.
15. ________ exhibits firing angle control.
a) Only TCR
b) Only TSR
c) Neither TCR nor TSR
d) Either TSR or TCR
View Answer
Explanation: Only TCR exhibits firing angle control. The thyristor-based ac switch of TCR with its firing angle controls the conduction time and, therefore, current through the reactor. In TSR for achieving the stepwise control of effective reactance firing angle control is avoided.
Sanfoundry Global Education & Learning Series – Flexible AC Transmission System (FACTS).
To practice all areas of Flexible AC Transmission System (FACTS), here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
